摘要
用溶胶-凝胶法制备的羟基磷灰石(Hap)去除水溶性铅离子时,在pH2￣6范围内反应速率与pH呈线性关系;Hap对水溶液中Pb2+的主要作用机理是溶解-沉淀作用,去除过程是一个复杂的非均相固-液反应;Hap在不同pH下的表面电动势ζ均为负值,且随pH的增大,负电性增强;反应生成的产物为稳定的羟基磷铅石,可以避免二次污染。含铅废水经Hap处理后可达到生活饮用水标准。
The mechanism of interaction between aqueous lead and hydroxyapatite （Hap） prepared by Sol-Gel method is investigated. The reaction rate has linear relation with pH which the linear range is 2-6. The removal of aqueous lead by Hap is a complicated non-homogeneous solid/liquid reaction, and the main action mechanism is dissolution-precipitation. The ξ potential of Hap is negative in varies pH, and the electronegative increases as pH increases. Previous work has showed that the secondary pollution can be avoid because aqueous lead formed lead hydroxyapatite which chemical stability is very high. The wastewater can reach drinking standard alter treated by Hap.
出处
《非金属矿》
CAS
CSCD
北大核心
2006年第4期50-52,共3页
Non-Metallic Mines
基金
武汉市科技局科技开发基金资助项目(项目编号:20026002098)
关键词
HAP
铅离子
机理
溶解-沉淀
hydroxyapatite aqueous lead mechanism dissolution-precipitation
